mtd: add read_byte support to plat_nand

Lantiq SoCs have a External Bus Unit (EBU) that is used to attach MTD media.
As we need to co-exist with PCI on the same bus, certain swapping settings must
be applied. Similar to the NOR map driver we need to apply a fix to make NAND
work. The easiest way is to use byte reads.

Signed-off-by: John Crispin <blogic@openwrt.org>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

2 files changed, 2 insertions, 0 deletions

diff --git a/drivers/mtd/nand/plat_nand.c b/drivers/mtd/nand/plat_nand.c
index fd2d2a1b78b..1bcb5204042 100644
--- a/drivers/mtd/nand/plat_nand.c
+++ b/drivers/mtd/nand/plat_nand.c
@@ -79,6 +79,7 @@ static int __devinit plat_nand_probe(struct platform_device *pdev)
         data->chip.select_chip = pdata->ctrl.select_chip;
         data->chip.write_buf = pdata->ctrl.write_buf;
         data->chip.read_buf = pdata->ctrl.read_buf;
+        data->chip.read_byte = pdata->ctrl.read_byte;
         data->chip.chip_delay = pdata->chip.chip_delay;
         data->chip.options |= pdata->chip.options;
         data->chip.bbt_options |= pdata->chip.bbt_options;
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 627f0c575ac..94a6679bfc2 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -654,6 +654,7 @@ struct platform_nand_ctrl {
         void (*cmd_ctrl)(struct mtd_info *mtd, int dat, unsigned int ctrl);
         void (*write_buf)(struct mtd_info *mtd, const uint8_t *buf, int len);
         void (*read_buf)(struct mtd_info *mtd, uint8_t *buf, int len);
+        unsigned char (*read_byte)(struct mtd_info *mtd);
         void *priv;
 };